want to change the selected option in the marquee through the button
related codes
https://jsfiddle.net/vr8ymb26/5/
The expected result of
https://jsfiddle.net/vr8ymb26/5/
The expected result of doesn't quite understand what your problem is.
look at your code, no matter which cities are selected now when you click the button, you will choose Guangzhou or Shenzhen.
what do you mean the click hasn't changed?
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